Like Flasher and OldLincoln have said, the CBST and other hybrids like it aren't necessarily the best choice, when it comes to individuals who must disarm and re-arm, particularly in compromised/awkward positions (such as in-vehicle).
What makes these hybrids so comfortable, conceal so well, and also so stable for the active user also makes them somewhat harder to put on - all the moreso when you have a hybrid that somewhat loses its retentive capabilities when it's not physically on-body (i.e. more the CBST than the Comp-Tac Minotaur).
Sure, the Garrett Silent Thunder/Slim/Slim II does make it much easier for the user to arm-up or re-arm: even if you're stuck inside a subcompact vehicle, it takes all but a little shift of your hips, and you can literally jam the holstered pistol - and completely safely, at that - down your pants leg and have it positively latch on to your belt.
But at the same time, the Garrett isn't without compromises, either. While I find my Silent Thunder Slim II (for my Kahr PM9) to be the most comfortable full-hardshell-kydex holster I've ever tried (and it is actually so comfortable that it's my preferred long-drive combo), it should still be said that it is a full-hardshell holster: some may not find it as comfortable. Similarly, it has only one clip, which can cause it to shift, particularly for more active users and/or those whose belt its clip doesn't quite mate perfectly with.
No holster is perfect for all occasions. :smile: There's always going to be one or another that's better/worse for the job. :smile: And yes, I also own a CBST (as well as a MTAC), among other holsters. I'm not making this post to say that one holster is better/worse than another - only to point out that your lifestyle needs may well affect your holster choice.